1. What is calculus
Calculus (from Latin calculus, literally "small pebble used for counting on an abacus")[1] is the mathematical study of continuous change
Calculus is the study of continuous transformation using mathematical methods. It has two
major branches: differential
calculus (concerning rates of change and slopes of curves)
- integral calculus (concerning accumulation of quantities and the areas under and between curves); : rate of change and magnitude of transformation: slope of the curve) - integral (with respect to the accumulation of quantities and the area under and between the curves); twobranches are related to each other by the fundamental theorem of calculus. The fundamental theorems of integration are interrelated. 2. How is the sine curve generated? A sine wave is the projection of a circular motion on a straight line. So the basic unit of the frequency domain can also be understood as a circle that is always rotating.
In physics, radio waves are generated by changing electric and magnetic fields, which are perpendicular.
The strength of the electrical signal we measure is the circular motion of the magnetic field around the time axis.
3. Fourier transform
http://blog.jobbole.com/70549/
4. Effect demonstration
Crazy Tentacles - Grant Kot
's crazy tentacles: http://grantkot.com/sine.html
https://daily.zhihu.com/ story/3935067
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